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4.2 | Newton's First Law of Motion. The Meaning of Inertia |
In these revision notes for Newton's First Law of Motion. The Meaning of Inertia, we cover the following key points:
Newton's Laws of Motion deal with forces acting on objects. The Newton's First Law of Motion says:
"If no force is acting on an object or when the resultant of all forces acting on it is zero, the object will still be at rest if initially it was at rest or it will continue moving at constant velocity (at terminal velocity) if initially it was moving."
When the resultant force at an object is zero, we say, "the forces acting on it are balanced, otherwise, they are unbalanced."
Inertia is the tendency of objects to preserve their previous state of motion. Inertia is a quantity related to the mass of objects. Thus, greater the mass of an object, higher its inertia (more inert the object is).
In scientific terms, we say, Mass represents a quantitative measure of Inertia, which is a fundamental property of all matter.
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